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Steel structural plate consists of corrugated steel sections that are bolted together to form the required shape. The corrugated sections are commonly referred to as plates and have a standard corrugation profile of 6 x 2 inches that are formed perpendicular to the length of the culvert bridge.

Structural plate structures are specified where the pipe required exceeds the size that can be shipped to the job site, or where earth cover is so great that the wall thickness furnished by a shop-manufactured pipe will not meet design requirements.

Standard plates are fabricated in three lengths and several different widths. These plates are available in thicknesses from 0.111 inches to 0.380 inches. Plates are furnished curved to various radii and are clearly identified by the fabricator for field assembly. The fabricator provides assembly drawings to aid the installer.

The plates are assembled into various shapes as indicated in the table below. The shapes include round, pipe arch, singles-radius arch, horizontal ellipse, low profile arch, high profile arch, pear, underpass and vertical ellipse, special shapes, and other sizes of standard shapes beyond what is shown in the tables, are also available, The fabricator provides detailed assembly instructions with each structure.